n is either 1 (true) or 0 (false). The default value is 1.
When ZSTU is enabled (n = 1), InterSystems IRIS® data platform runs the user-defined startup from the ^ZSTU routine.
Changing This Parameter
On the Startup page of the Management Portal (System Administration > Configuration > Additional Settings > Startup), in the ZSTU row, select Edit. Select ZSTU to enable this setting.
Instead of using the Management Portal, you can change ZSTU in the Config.StartupOpens in a new window class (as described in the class reference) or by editing the CPF in a text editor (as described in the Editing the Active CPF section of the “Introduction to the Configuration Parameter File” chapter in this book).